期刊
CATALYSIS TODAY
卷 360, 期 -, 页码 2-11出版社
ELSEVIER
DOI: 10.1016/j.cattod.2019.11.032
关键词
Faujasite; Hydrothermal synthesis; Si/Al ratio; 5-HMF; Esterification
资金
- Facultad de Ciencias Quimicas, Universidad Autonoma de Nuevo Leon (UANL), Mexico
- Mexican Council for Science and Technology (CONACyT) [619679]
This study focuses on preparing FAU-type zeolites with various Si/Al ratios and crystallization times to enhance surface area properties. Bimetallic Pd-Ru and Pt-Ru were loaded onto the zeolite matrix, and the interaction between the properties of zeolitic support and the metallic species, specifically Pd, positively affected the catalytic process. Lower Si/Al ratios favored catalytic activity, and longer crystallization times improved surface area and crystallinity.
We present this study on FAU-type zeolites were prepared varying the Si/Al ratio (4, 5 and 6) and crystallization time (4, 6 and 8 h) to produce a highly pure and homogeneous material with enhanced surface area values. Bimetallic Pd-Ru and Pt-Ru (0.5 wt.% of each metal) were impregnated onto the zeolites matrix by the incipient wetness impregnation method. The materials were characterized by X-ray diffraction (XRD), nitrogen physisorption, Fourier Transform Infrared spectroscopy (FT-IR), Scattering Electronic Microscopy (SEM), Scattering and Transmission Microscopy (STEM), temperature-programmed desorption (TPD), temperature-programmed desorption (TPR) and Inductively Couples Plasma- Mass Spectrometer (ICP-MS). Results indicated that using lower Si/Al ratios favored the catalytic activity. Also, the longest crystallization time had a positive effect on surface area, homogeneous particle size distribution and crystallinity. The catalytic performance in the esterification of 5-hydroxymethylfurfural (5-HMF) to produce 5-acetoxymethylfurfural (AcMF) was investigated. The maximum 5-HMF conversion of 87.28 % was achieved using pure zeolite with relation Si/Al = 5, and 8 h of crystallization. Pd-Ru supported onto same zeolite showed a conversion of 84.22 %. The highest selectivity towards AcMF of 71.29 % with pure zeolite Si/Al = 5 and 8 h of crystallization was achieved, followed by Pd-Ru/FAU with Si/Al = 5 and 8 h of crystallization, achieving 60.42 %. Finally, results shown that the interaction between the properties of zeolitic support and the metallic species, specifically Pd, had a positive effect in the catalytic process the pristine zeolite showed improved catalytic characteristics related to its acid strength.
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